Shutter for photographic cameras.



A. G. PIGKARD.

APPLICATION FILED 0OT.19, 1912.

SHUTTER FOR PHOTOGRAPHIG CAMERAS.

Patented Oct. 28, 1913.

Fig.1.

WITNESSES. WK a' 4 SHEETS-SHEET 1.

INVENTOR \y 7 1052221 A. G. PIGKARD. SHUTTER FOB. PHOTOGRAPHIC CAMERAS.

APPLICATION FILED 0032.19, 1912.

11,077,157. Patented 00t.28,1913.

4 SHEETSSHEET 2.

'IIIIIJIIIII'IIIIIIIIIAIII '77 I llll lllm.

A. G. PIGKARD. SHUTTER FOR PHOTOGRAPHIG CAMERAS.

APPLICATION FILED 00T.l9, 1912. 1,077,1 57. Patented 0011.28, 1913.

4 SHEETS-SHEET 3.

Fig. 7. WITNESSES. lNVENTOR 'fii/ ul .Pz/clarcl ga /4f I A. G. PIGKARD. SHUTTER FOR PHOTOGRAPHIG CAMERAS.

APPLICATION FILED 00119, 1912.

Patented Oct. 28, 1913.

4 SHEETS-SHEET 4.

WWNESSES mvemon' o'ol'ard Width of the slit or aperture in the blind is varied to determine the length of exposure...

spring roller at the bottom of the shutter, and the lower blind .is mounted upon a bronght-upthe sides ofthe shutter and are ulb exposu y the s ng ope at n f l u cause them to rotate together, and. for re.- .leasing'thern to.permit of one rotating ind p endently of the other when required.

7 mechanism when the'blind is closed a d not lower blind has been brought to rest and t g h r d ing the exp sure moveme oi th bl nd and oamil ke o p m f the closing oi thoape u be ween the 40-blinds.

- EDS ATES" PATENT OFFICE.

f ABT'HVB"GBAYPP;QM3D; 91' ENGLAND. snowman. ma rs sosasraio .QAMERAS.

To all whom it may conce n Be itk Wn'th t .A rH R G I K- Ann, a British subject, res idi ng,. at"AltriI1- cha n, countyof flhester, England, have invented-certain new and useful Improvements in Shutters for Photographic Cameras, of which the following is aspecification. f

This invention relates to rnechanism for setting and releasing roller blind shutters known as focal plane shutters in which the The aperture is opened asthe shutter is being set by the upper blind being caused to move independently a distance corres 0ndingv to'the desired aperture, and is close after exposure by the upperblind being caused to independently continue its traverse after the until its lower edge has overlaped'the lower edge of the upper blind. In such "shutters the upper blind is mounted upon a setting roller; at the top of the shntter and has tapes connected thereto whichare brought down the sides-of the shutter .andattached to a spring roller at'the bottom ofthe shutter and has tapes connected thereto which are attaehed to a setting rollerat' the top of the shutter. The .two upper. winding rollers carry pinions geared 'to two.setti ng wheels on aconnnon aids, such wheels being locked ."The ofjectof theiinven on, is t obta n the a terat-ionot the s e5 ft o' itand a o h var ti nib w e ins ntane nd turningthe winding knob a less or reater x ent, and h i ve s s n; t o construction and arrangement of mechanism for' connect;i ngthe otwosetting wheels ,to

,he invention will be fully described with reference to the accompanying drawings w i h for the sake f slo e f d l a dr wn to a s al do ble a ize 1 Figure l is aside elevation of the shutter ,spe isaaoiwrmanhun i, atented Oot.2s,1913. Application filed October 19 1912. Serial No.-726,-787.

set. Figure2 is a side elevation of; same when-the blind iswound upand set forin stantaneous exposure. Eigure 3 is a side ;elev.ation of same when the blind is wound up andsetfor bulb exposure. Figure 4 .is a side elevation of same when the blind is ,open for bulb exposure. Figure 5 is a sidegelevation of one ofthe setting wheels.

Figure 6 is a plan view ob both setting wheels. Figure 7 ,shows details of the set tin Ywheels. Figure 8 is a front elevation of igureal.

The blind A is of the ordinary two-part ,forrn, the upper part a being-attached to and capable of ,belng wound upon thesettin roller (2* and connected to the spring .rol er a by tapes; andthe lower part a being-attached to-the spring winding rollera and connected to the setting roller 0;? by tapes. The spring winding rollers a and-a lact independently of one another but the springs are preferably geared together so as tobe tightened and released sixnnltaneously to maintain the springs at the same tension. The settingroller e ofthe upper blind a is fitted with a pinion Z) andthe setting-roller a of the lower blind a with a inion b,

.whichpinions are in gear respectively-with 2 .two settrn wheels B and B.

blind a simultaneously, after which. the setting wheel B can be rotated to a further-ex- ;tent, and with itthesetting roller o to set the edge of the upper blinds atanyf desired distance frornthe edge of the lower blind a,

or in other word to regulatethe width-"of.

the exposure slit in the blind. The setting v The setting wheels-B and B are arranged wheel 'B is mounted, on a stud b and is rotated by, a knQbC secured toit-he boss b a pin or screw'c rjOn the face of-thewhee B a stud or holes or, .preferably, a, number ofratchet ;te eth 0r indentations e are formedythe purposejnf which will be subsequently described.

The second setting wheel-B is mounted upon theboss of the wheel B and through it an opening forconcentric slot d" is prerced to. ,receive the stud d on ,the face ofthe wheel'B. ,A s ring controlled catch D is pivoted to {the ace bi-the wheel B"adj acent one end of the slot 'duto en agethe'end o f the-stud d ,which projects rough the slot. A ratchet notch or tooth f is formed in theperlphery pin (1 .is :afiixed, and a number of between the blinds.

of the Wheel B, with which a releasing pawl F engages to hold it when set against the tension of the spring of the winding rollers a and a. A pawl E is pivoted on the face of the wheel B, and the end 6' projects through a hole in the wheel to engage the holes or ratchet teeth 6 in the face'of the wheel B, for the purpose of locking the wheel B, when set to the wheel B, and holding it against the tension of the springs of the winding roller (1 of the upper blind a through the wheel B and releasing pawl F. The pawl E is provided with a projecting pin 6 andan inclined plate G is fitted at one side of the wheel B over which the pin 6 travels at the end of the rotation ofsaid wheel, to release the wheel B and permit of it being rotated sufiiciently to close the slit I The rotation of the wheel B is limited by a stop 9' against which the pin 6 strikes, or, instead, a stop pin g may be fitted to wheel B to engage the stop 9, and the rotation of the wheel B is limited by the stud d reaching the end of the concentric slot d. On the face of the wheel B there is also pivoted a Ushaped tumbler H which, when the wheel B has nearly made a complete ,revolution and the stud d reaches the end of the concentric slot at is caught by the stud all, and turned into a horizontal position,to engage a suitably placed stop lever K, to arrest the rotationof the wheels for a bulb exposure. At one side of the wheel B a disengaging piece or stationary block L is fitted, against which the spring controlled catch D contacts when the wheels B and B have made half a revolution, to disengage the catch from the stud d and allow the rotation of the wheel B to proceed, to furtherwind up the upper blind to give the desired size or width LlZO' the exposure aperture between the edges of the two blinds.

The mechanism before being set and the shutterclosed is in the position shown in Figure 1. To set it for instantaneous exposure, the knob Qis turned in the direction of the arrow and turns the setting wheel B with it, and the stud d in the slot d, by

reason of being caught by the spring catchv D, carries the second setting wheel B around at the same time until they have made half a revolutionand the pawl F drops into the ratchet notch f. This movement draws the edges of both the upper and lower parts a, a of the blind A across the focal plane without separating them or opening the ex: posure slit between them. To open the exposure slit and adjust its width, the knob C is turned farther until. the pointer end a of the ,knob Q comes opposite one of the index marksm on the wheel B, each succeed .ing one indicating a wider slit. This moveto any desired extent, to widen the. ex

ward to release the stud d and thereby allow the setting wheel B to rotate, while the setting wheel B remains stationary, the stud 03 moving along the slot d until it assumes the position shown in Figure 2, (or any position intermediate those shown in Figures 1 and 3.) In this position the pawl E engages the ratchet holes or slots e in wheel B and prevents its rotation in the reverse direction, the wheel B being the while held by the pawl F. The additional movement of the wheel B draws back the upper blind a osure slit or aperture between the two blin To release the blind for exposure, the pawl is withdrawn by the end of the lever K being pressed. against it, or by other means. On the'withdrawal of the pawl F and therelease of the wheels B and B, said wheels 'rotate together in the reverse direction until the movement of the wheel B is arrested by either the pin e of the pawl E or the stop pin g striking the stop 9. Simultaneously therewith, the pin 6 slides up the incline G, raising the pawl E out of engagement with the ratchet holes or notches e in the wheel B and permitting the latter to continue its movement to bring the two edges of the blind together to close the slit and until the stud 03 again engages the catch D, when the mechanism is again in position to be re-set for another exposure. I

Fora bulb exposure, the knob C, and, with it the wheel B, is rotated beyond the position shown in Figure 2 until it reaches the position shown in Figure 3. In assuming this position the stud d engages the tumbler H and raises it into a horizontal posi-' tion and retains it there while the wheel is released by the withdrawal of the pawl F. The movement of the lever K to withdraw the pawl throws the other end into the path of the tumbler Hand arrests the rotation of the wheel B simultaneously with that of the wheel B by the stop 9, and the shutter remains full open so long as the lever is held in that position by the bulb or releasing lever. The movement of the lever L to its normal position frees the tumbler H, and

the wheel B continues itsotravel to close the blind aperture and return to the position shown in Figure 1 in readiness to be reset for another exposure.

'What I claim as my invention and desire to protect by Letters Patent is 1. In a roller blind shutter, the combination, with an upper blind settin wheel and a lower blind setting wheel, 0 means for locking the two wheels together comprising a catch on one wheel, a stud on' the other wheel engageable by said catch, and a fixed block in the path of the catch b which the catch is operated to release sai stud'when the wheel has traveled a predetermined distance.

2. In setting and releasing mechanism for roller blind shutters, the combination, with a pair of separate setting wheels for controlling the upper and lower blinds, the

upper blind setting wheel having a slot blind, the latter being provided with a concentric slot, of a catch pivoted to. the lower blind setting wheel, a stud projecting from the upper blind setting wheel through said slot, with which stud the catch engages to lock the two wheels together during the setting of the shutter, and a pawl pivoted to said lower blind settingwheel to engage the upper blind setting wheel and prevent its rotation in a backward direction independently of said lower blind setting Wheel until the pawl is raised.

4. In setting mechanism for roller blind shutters, the combination, with two setting wheels to control the upper and lower blinds respectively, the upper blind setting Wheel being formed with a hole and the lower blind setting wheel being formed with a series of notches, of a spring pawl pivoted to the lower blind setting wheel and project- I ing through said hole to successively engage Sfild notches, and a fixed inclined piece in the path of said pawl to raise the latter and release the upper blind setting wheel, to permit the further movement of that wheel.

5. In setting and releasing mechanism for roller blind shutters, the combination, with two setting wheels to control the upper and lower blinds, respectively, and means for locking the two wheels together, of a tumbler pivoted to the lower blind setting wheel, a stud projecting from the upper blind setting wheel and engageable by said tumbler, andia pivoted lever in the pat-h of the tumbler to arrest the rotation of the wheels.

6. In a roller blind shutter, the combination with a setting wheel for controlling and setting the upper blind, and a setting wheel for controlling and setting the lower blind, the latter wheel being provided with a concentric slot, of a catch pivoted to the lower blind setting wheel, a stud projecting from the upper blind setting wheel through said slot and engageable by said catch to lock the two wheels together, a pawl pivoted to said lower blind setting toengage said upper blind setting wheel and prevent its rotation in a backward direction independently of the lower blind setting wheel until the pawl is raised, a tumbler pivoted to the lower blind setting wheel to engage said stud, and a pivoted lever in the path of the tumbler to arrest the rotation of the wheels.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

J. OWDEN OBRIEN, GEO. H. OBRrEN. 

